Air pump



- My invention relates Patented Sept. '1, 1931.

- UNITED STATES PATENT OFFICE 8min. smvnns, or warnnmo, IOWA.

mrnnr Application filed February 8, 1930. Serial No. 425,620;

air pumps and an object of my improvement is to furnish a device of this class adapted for removing deposits or obstruct-ions from conduits, lavatories, toilet seats or their traps by the propulsion of charges of compressed air thereinto.

Another object of my improvements is to combine in this devicea compression-pump for supplying air under a desired pressure in a chamber having a delivery nozzlewith a valve controllable manually fromwithout, the pump having manually controllable operatlng means also without the chamber and arranged relative to the-means forcontrolling said valve, that the valve may be opened conveniently or withvthe-same hand that is used to operate the pump, when thedesired pressure of air in the chamber has been attained. p 7

Another object is to supply for said chamher a reversibly mounted delivery device of elastic material and having op osite parts shaped differently for use with variously sized and shaped conduit openings, and employing removable fastening means for securin said device in either of its'said re-- verse ositions and against displacement.

Anot er object of my improvements is to combine with a discharge valve-seat of said chamber a valve therefor having an entrant guide terminalto frevent unseating of the valve when opene and said valve having a handled stem traversing the chamber outwardly, manually operable for seating or-unseating said valve.

Another obJect is to supply an air-pump I in combination with said chamber and to compress and deliver air under compression thereinto by manual operation without the 'chamber, said pump being supplied with a resiliently controlled deliveryterminal valve for cooperating with a piston, whereby the reciprocatory pumping elements of the pump .are governed suitably in any working positions while compressing and delivering compressed air to the chamber...

My invention is not restricted to theprecise construction or arrangement of parts shown herein, nor the various details, as the to improvements in same may be modified variously without deartin from the scope of this invention or ram is e protection of the appended claims. Ihave accomplished the above objects by the means which are hereinafter described til and claimed, and which are illustrated in the accompanying drawings, in which 1 is. a central vertical longitudinal section of my improved air pump, with some parts in elevation. Fig. 2 is a vertical transverse section 00 tain applications of the device.- Fig. 3 is a 7 top plan of the compression chamber of the device with associated operating devices.

The numeral 1 denotes a hollow cylindrical air-compression chamber having'closed upper and lower heads 3 and 2 respectively, The lower head 2 has an aperture with in 'wardly bent interiorly threaded rim 4 to seat a threaded end of a depending discharge conduit 5, a nut Gseated on the conduit securing it in place. The lower portion of said conduit 5 is exteriorly threaded at 21-to seat first a stop-nut 22 and at the lower end a securing nut 23. V

The numeral 17 denotes an elastic rubber discharge nozzle or cup of conical hollow shape with a depending and thinner concentric rim 18; The upper part 19 of said cup is conically diminished at 19 for a p v to be disclosed. The threaded part 21 o the conduit 5 traverses and fits the central bore 20 of the upper part 19 which is thus clamped securely on the conduit 5 by the lower nut 23. As shown in Fig. 2, when the nut 23 is removed, the cup 17 may be inverted,and after the nut 23 has been mounted on the threaded part 21 of the conduit against the upper nut 22 the part 21 therebelow may be seated in the hollow 20, the lower end of the conduit thus being spaced 9. short distance above the lower end of said hollow, which thus provides an elastic termination for the coned-part 19. The cup 17 is used to sealingly and elastically conformably fit around the mouth of rather large diameter of a con- 1 duit or hollow body to be cleaned, such as that of a toilet seat above a trap or the like, and the coned diminished opposite part 19 because of its coned shape may be inserted in a smaller opening as that of a pipe or the like to yieldingly fit and seal the same, in either case the elastic conformability thereof pre-' venting escape of air at. the joint.

The upper end of the conduit 5 extends a short distance within the chamber 1 and thus provides a valve-seat therein. The upper head 3 has an inwardly rimmed and interiorly threaded apertured seat 7 for a threaded sleeve 8 projecting upwardly having securing and locknuts 9 and 10 thereon, and a. valvestem 12 is slidably fitted in said sleeve 8, and has a cross-handle 11 at its upper end, and a stop annulus fixed at 13 thereon within the chamberto limit. upward movement of the stem. The lower termination of the stem 12 is threaded to receive first a conical capnut 14 which extends more or less at all times intothe valve-seat end of 'saidconduit 5 to prevent displacement of an apertured ruber coned valve 15 secured on the stem 12 by an upper nut 16, said valve 15 fitting and closing said seat when the handle 11 is manually pushed downwardly. The handle is also used manually to seat or especially unseat the relief-valve 15 when the air is sufli- .ciently compressed in the chamber 1.

The upper head 3 is also aperturedwith an inwardly turned interiorly threaded rim 24 to seat the threaded part of a hollow sleeve nut 25 which is traversed by the cylinder26 of a manually operable air-compression pump having a removable centrally apertured cap 27 threaded thereon. The aperture 28 of said cap is of larger diameter than apiston-stem 30 traversing it, and having a top cross-handlc 31. The aperture thus serves as an airinlet for said cylinder. The stem 30 has side projections29 to serve as stops to limit downward movement of the stem. A downwardly opening rigid cup 39 on the lower end of said stem gives support to an inclosing cup of flexible leather or other material fitting the inner wall of the cylinder yieldingly, the cup 39 being spaced to allow of play of the rim of the cup 40, whereby when on its upward or suction stroke the flexible rim collapses inwardl to permit air to pass the piston downwar l and when the piston is pushed down the air is compressed under the cap 40 to cause-its rim to hug the cylinder and preventing return leakage of air. The coiled spring 41 on the stem 26 serves as an elastic stop at the upper end of the piston stroke.

The lower end of the linder 26 is open with an inturned conical nm 32 to fit upon a diminished part of an apertured rubber valve 33 mounted on the short stem 34 of a disk 36 apertured at 35 and slidably fitting the inner wall of the cylinder above a'spacing sleeve mouth or orifice of a device to be cleaned of adherent substances, as the case may be, then the operator, by reciprocating the handled stem-31 of the pump, the valve 15 having been previously manually closed, pumps air into the chamber 1 to a suitable degree of compression, which may vary from about 30 to 80 .pounds per square inch, the degree of compression being indicated on the scale 44 seen through a window 43 of a pressure gage 42 in communication with the top of the chamber, and by an index finger 45 movable over the scale. The hand which holds the pump handle 31 can then conveniently also grasp the cross-handle 11 on the relief-valve stem 12 to lift the valve from its seat, discharging the compressed air in a single charge from the chamber 1 through the member 17 into the device to be cleaned, the concentrated force of the air charge being usually suflicient to detach and discharge any adherent deposits, but if necessary the operation may be repeated.

All of the operating and connected elements of this device are so removably secured together, as to remain in place without loosening or detachment during such operations.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is: p

1. In a valve-controlled air-compression chamber, an air-pump mounted removably in said chamber having a manually operable flexibly cupped piston and an air-inlet permitting air to pass the piston on its suction stroke only, said pump comprising a cylinder containing said piston and having an open inner end with a valve-seat, an apertured slide-member fitting the cylinder and having a rigid connection with a valve mounted thereon to control said valve-seat delivery, the valve being without the cylinder, a resilient compression spring engaged between said valve-seat and said slide-member to normally retain the-valve against its seat, the other end of said cylinder project-ing without the chamber and having an apertured end which provides said air-inlet, and said piston having a handled stem projecting loosely through said inlet.

2. In a valve-controlled air-compression chamber, an air-pump cylinder mounted to depend within said chamber, having its inner end shaped with a valve-seat and its outer end apertured centrally as an air-inlet, a handled stem slidable loosely in said air-inlet and having' on its inner end within the cylinder a flexible cupped piston with aniuterior rigid lit) cup whereby air may pass the piston only on its suction stroke, an elastic coned valve fitting said valve-seat from without and having a short stem extending into the cylinder with an apertured head thereon fitting the cylinder slidably, a coiled compression spring around said stem and engaged between the lower seat part of the cylinder and said head, and a. coiled compression spring mounted loosely on said piston-stem to serve as an elastic stop against the upper cylinder head.

3. In an air-pump, the combination of a cylinder having an apertured head, a pistonrod traversing loosely said aperture from without, a piston secured on said piston-rod composed of a rigid backing member spaced from the inner wall of the cylinder and a flexible member collapsible thereagainst to permit passage of air past the piston on its suction stroke only, and a resiliently controlled apertured valve device in the delivery end of the cylinder separably engageable with the piston to be actuated thereby in one direction to discharge air at the latter part of the suction stroke of the piston.

In testimony whereof I afiix my signature.

SAMUEL SILVERS. 

